Which boy king made popular the term "La Cravate" for the neckties he made his royal court wear (the predecessor to modern neckties)?

The origin of the necktie can be traced back to the 17th Century, during the 30 Years' War (1618-1648). The French hired Croatian mercenaries who wore traditional knotted neckerchiefs around their necks as part of their uniform. This held the top of their jackets together and was more practical than stiff collars.

Towards the end of the war, Croatian soldiers were being presented to French King Louis XIV. During his inspection, the king noticed these neckerchiefs and took a strong liking to them. The boy-king began wearing these himself around 1846, at just seven years old.